I have visited dozens of websites, and I have yet to get a single image to pop up enlarged even a little bit. It'll show me a pop up of the image at exactly the same size as is shown on the web page, but this is entirely useless.

I used Thumbnail Zoom Plus for many years, and found it to be a completely fantastic tool. But for some reason, this "Quantum" upgrade is not so "quantum" after all, since there's zero backward compatibility. I didn't even realize how integral Thumbnail Zoom had become to my natural browsing behavior until it was gone. I feel like I've gone internet-blind and no-one can help me.